DISPENSING COVER FOR MEMBRANE GAS METER WITH ROTARY DISTRIBUTION DRIVE.

摘要

The invention relates to a gas meter comprising a plurality of measuring chambers, and a rotary distribution valve (2) about an axis of rotation on the upper surface of a dispensing lid (1) having a plurality of openings (10-12 ) each connected to a measuring chamber, the slide (2) allowing the gas to enter and exit alternately measuring chambers during its rotation about the axis, and the cover (1) comprising at least two rings sealing member (15a, 15b), concentric with respect to the axis, on the upper edge of which planes slide sliding contact surfaces (25, 26). According to the invention, the plane upper edge (15d) of at least one of the sealing rings has a non-circular shape defined in such a way that any point of the contact surface which faces this upper plane edge ( 15d) of non-circular shape is found, at least once on a rotation, without contact with this edge.Advantage: promotes the evacuation of contaminating agents